#include<iostream> using namespace std; int main(){ int a,n,i,j,t; n=1; cin>>a; t=a; while(a>=10) {a=a/10; n++;} int b[n]; for(i=0;i<n;i++) {b[i]=t%10;t=t/10;} for(i=0;i<n;i++) {for(j=n-1;j>i;j--) {if(b[i]==b[j]) {b[j]=-1;} }} for(i=0;i<n;i++) {if(b[i]!=-1) {cout<<b[i];}} }